maineplower
Well-Known Member
I’m trying to diagnose a problem with my travel speed not changing and being jerky when the rpm’s are up. I have the palm version of drzx and I keep getting connection problem. Any advice? Thanks
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Hitachi ex120-2 drzx connection problem
- Thread starter maineplower
- Start date
mg2361
Senior Member
Looking into your diagnostic connector, pin 1 is top left, pin 2 is top right, pin 3 is bottom left and pin 4 is bottom right. What voltages do you have at each pin.
Also check your Pump and Valve controller. Is the green light on top of it flashing once a second?
Also check your Pump and Valve controller. Is the green light on top of it flashing once a second?
maineplower
Well-Known Member
I will check the voltage in a few hours, lights are flashing red.
maineplower
Well-Known Member
Pin 4 is the only one with voltage 4.5 volts
mg2361
Senior Member
I cannot remember if it is supposed to be green or red. I don't think the color is important at the moment. If they are flashing once a second then PVC should be ok. If it is flashing a random pattern then it is flashing a diagnostic code.
Pin 3 should have had approximately 1 volt.
Did you check the 1A fuses #4 and #7?
Pin 3 should have had approximately 1 volt.
Did you check the 1A fuses #4 and #7?
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maineplower
Well-Known Member
The lights are blinking normally. If I short pin 2&4 it flashes code 26.
mg2361
Senior Member
Open circuit in the DP sensor circuit (sensor or wiring/connector).
maineplower
Well-Known Member
Yes I’ve gone through the checks in the manual and the dp sensor failed, I have one on order. I still can’t connect the drzx palm to the machine. I’ve tried reversing the connection and still no luck.
RPMex
Well-Known Member
I purchase a Dr Zx and it would not connect to my 1996 Ex100-2. I ended up downloading the MPDr buying the interface cable and that worked just fine. Good luck!
maineplower
Well-Known Member
What’s the part number for the cable?
RPMex
Well-Known Member
maineplower
Well-Known Member
Thanks for the offer. I’m in old orchard beach, I’ll probably just buy one. Thanks again!
maineplower
Well-Known Member
I changed the dp sensor not much difference. The travel speed is still jerky when trying to move in anything other then full reverse or forward. There is also a slight hydraulic noise like a relief valve when operating the machine, the hydraulic oil also gets very hot after a while . The machine operates smooth (other then travel) motor doesn’t bog runs fine. Any ideas???
mg2361
Senior Member
How hot is hot. Was the temperature measured? I would check system relief pressure and propel crossover relief pressure.
maineplower
Well-Known Member
I didn’t measure the temperature but it was real hot to touch hydraulic components. I need to get a hydraulic pressure test kit. What size fittings will I need?
mg2361
Senior Member
Don't know. I have limited information on the 120-2. If you have the manual you should be able to figure it out from that. If you get MPDr you can check some pressures with that.
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maineplower
Well-Known Member
Where do I get mpdr? The dealer?
PM tool king he will help you out with that
mg2361
Senior Member
Nope. It is actually a dealer only tool but there are piroted versions out there on the web. See RP's post #9 above.